Study on the efficacy of early treatment with pirfenidone on the lung function of patients with idiopathic pulmonary fibrosis

Table 4 Comparison of the levels of pulmonary function indicators among the three groups

Group	Number of cases	Forced expiratory volume in 1 s in L	Forced vital capacity in L	Ratio of forced expiratory volume in one second to forced vital capacity
Observation group	60	3.56 ± 0.32	4.88 ± 0.44	79.39 ± 7.61
Later treatment group	55	3.14 ± 0.22	4.75 ± 0.13	70.36 ± 4.57
Control group	53	2.93 ± 0.21	4.15 ± 0.35	68.13 ± 6.41
F value		115.50	93.79	56.00
P value		0.000	0.000	0.000